9 Trouble-shooting Temperature head transmitter
50 Endress+Hauser
9.3 Application faults without messages
Application fault without
messages
General application faults
Application faults for RTD connection (Pt100/Pt500/Pt1000/Ni100)
Fault Cause Action/cure
No communication No power supply on 2 wire circuit Check current loop
Power supply too low (<10 V) Connect cables correctly to ter-
minal plan (polarity)
Defective interface cable Check interface cable
Defective interface Check PC interface
Defective head transmitter Replace head transmitter
Fault Cause Action/cure
Fault current
(
≤ 3.6 mA or ≥ 21 mA)
Defective sensor Check sensor
Incorrect RTD connection Reconnect cables correctly
(connection diagram)
Incorrect 2 wire connection Connect cables correctly to ter-
minal plan (polarity)
Transmitter programming faulty
(wire number)
Change parameter ’CONNEC-
TION’ (See “Description of unit
functions” on page 44.)
Programming Thermocouple set up (s.
chapter 6.2.3); change to RTD
Defective head transmitter Replace head transmitter
Measured value incorrect/inaccu-
rate
Faulty sensor installation Install sensor correctly
Heat conducted via sensor Take note of sensor installation
length
Transmitter programming faulty
(wire number)
Change parameter ‘Connection
type’
Transmitter programming faulty
(scale)
Change scale
Wrong RTD used Change parameter ‘Sensor type’
Sensor connection (2 wire) Check sensor connections
Sensor cable (2 wire) not compen-
sated
Compensate cable resistance
Offset incorrectly set Check offset
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